"We’re giving you a day of free unlimited UK data this Saturday December 8, so you can catch up on all the things you’ve missed. You don’t need to do a thing."

If you're in debt to Sky it might be that you won't get the free credit, so it's best to check with the provider.

GiffGaff, Lycamobile and Tesco Mobile also use the O2 network to provide customers their mobile service, but they're yet to reveal whether users affected by the outage will be compensated.

Here's how you can claim money back from O2 and other providers after its network went down.

In October, the O2 was down leaving thousands of customers unable to make or receive calls.

It also happened in September, as both Sky and O2 mobile networks went down due to Storm Ali.

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